Grohl sent an open letter Tuesday, calling the band "my life," but noting "it's a good thing for all of us to go away for a while."
Grohl told fans Saturday at the Global Citizen Festival he didn't know when the band would play together again, and affirmed that in the letter.
He created Foo Fighters in 1994 after his time as the drummer in Nirvana, recording the band's self-titled debut before inviting other members to join. The band has been one of rock 'n' roll's most enduring critical and commercial successes, winning 11 Grammys, including five earlier this year.
Grohl says he's now focused on his forthcoming Sound City documentary and album.